Run `autoconf' (and `autoheader', `aclocal', `automake', `autopoint' (formerly
`gettextize'), and `libtoolize' where appropriate) repeatedly to remake the
GNU Build System files in specified DIRECTORIES and their subdirectories
(defaulting to `.').

By default, it only remakes those files that are older than their
sources. If you install new versions of the GNU Build System, you can make
`autoreconf' remake all of the files by giving it the `--force' option.